The principle of checks and balances in the u. s. government is reflected in the a. appointment of cabinet-level officers by the legislative branch. b. creation of separate state and federal court systems. c. election of supreme court justices. d. ability of congress to override a presidential veto.

every society, in order to meet the needs of it's people, has to answer three basic questions:

- what should we produce?

- how should we produce it?

- for whom should we produce it?

this questions must be answered in order to, option b, aid in production decisions.

every country can't produce everything, no matter how rich their land is. it may be a matter of technology, resources or geographical conditions. so, these three questions must be resolved in order to get the most of the production of each land.

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